From 795f6689dec28f161afbf5964ef1b17288dd384d Mon Sep 17 00:00:00 2001
From: Jason Evans <jasone@canonware.com>
Date: Wed, 2 Nov 2016 18:09:45 -0700
Subject: Add os_unfair_lock support.

OS X 10.12 deprecated OSSpinLock; os_unfair_lock is the recommended
replacement.
---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 0d10143c..2713cbc2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1612,6 +1612,20 @@ if test "x${je_cv_builtin_clz}" = "xyes" ; then
   AC_DEFINE([JEMALLOC_HAVE_BUILTIN_CLZ], [ ])
 fi
 
+dnl ============================================================================
+dnl Check for os_unfair_lock operations as provided on Darwin.
+
+JE_COMPILABLE([Darwin os_unfair_lock_*()], [
+#include <os/lock.h>
+], [
+	os_unfair_lock lock = OS_UNFAIR_LOCK_INIT;
+	os_unfair_lock_lock(&lock);
+	os_unfair_lock_unlock(&lock);
+], [je_cv_os_unfair_lock])
+if test "x${je_cv_os_unfair_lock}" = "xyes" ; then
+  AC_DEFINE([JEMALLOC_OS_UNFAIR_LOCK], [ ])
+fi
+
 dnl ============================================================================
 dnl Check for spinlock(3) operations as provided on Darwin.
 
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